sdbusplus: Improve error handling

Ignore exceptions from sdbusplus for objects that are queried
as part of a property watch but are expected to be missing
when the BMC starts up.

Tested: The phosphor-dbus-monitor app does not core dump
with the latest sdbusplus changes.

Change-Id: I0f6a850f0e426478bd1ccacb910a44079b9c8a54
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>

1 files changed, 15 insertions, 7 deletions

diff --git a/src/sdbusplus.hpp b/src/sdbusplus.hpp
index f37f7de..0a8e715 100644
--- a/src/sdbusplus.hpp
+++ b/src/sdbusplus.hpp
@@ -102,15 +102,23 @@ class SDBusPlus
                            const std::string& interface)
     {
         std::vector<std::string> interfaces{interface};
-
-        auto object = callMethodAndRead<GetObject>(
-            MAPPER_BUSNAME, MAPPER_PATH, MAPPER_INTERFACE, "GetObject", path,
-            interfaces);
-
         std::string name;
-        if (!object.empty())
+
+        try
         {
-            name = object.begin()->first;
+            auto object = callMethodAndRead<GetObject>(
+                MAPPER_BUSNAME, MAPPER_PATH, MAPPER_INTERFACE, "GetObject",
+                path, interfaces);
+
+            if (!object.empty())
+            {
+                name = object.begin()->first;
+            }
+        }
+        catch (const SdBusError& e)
+        {
+            // Empty responses are expected sometimes, and the calling
+            // code is set up to handle it.
         }
         return name;
     }